Lens mount for cameras



A. S. HOWELL. LENS MOUNT FOR CAMERAS APPLICATION FILED OCT. 11, 1919.

1,417,526. Y a ted M y 30, 1922;

W. l q 5 1 cSnwsrzfor Q/berl S. Howe/K 1 WWW, attorneys.

I to the Serial No. 293,249, filed by me UNITED STATES.

PATENT oarice.

ALBERT S. HOWELL, OF CHICAGO, ILLINOIS, ASSIGNOR, TO BELL AND HOWELLOOMPANY, OF CHICAGO, ILLINO LENS MOUNT IS, A CORPORATION OF ILLINOIS.

FOR CAMERAS.

Specification 0 Original application filed April 23, 1919, Serial No.293,249. Divided f I.etter P- t n Patented May 30, 1922.

11, 1919. Serial .No. 330,144.

To all whom it may concern:

Be it known that I, ALBERT S. HOWELL, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented a certain new and useful Improvement in Lens Mounts forCameras, ofwhich the following is a full, clear, concise, and exactdescription, reference being had to the accompanying drawings, forming apart of this specification.

y invention relates to lens mount for cameras.

The invention contemplates a structure which permits of a quick andconvenient interchange of lenses and one of the features of theinvention relates to the provision of a structure which provides for thefocal adjustment of the lens, which is adapted to hold the lens firmlyupon the camera in an adjusted position, and which permits of a quickand convenient interchange of lenses. Another feature of theinventionrelates provision of structure whereby a lens may be mounted within'abush in a simple and secure. manner and which is particularly adapted toa bush formed of aluminum.

' The above features and certain other features hereinafter appearingare embodied in the preferred form of my invention'hereinpointed out inthe claims.

In the said drawings Fig. 1 is a View in side elevation of a lens mountembodying the features of my'invention. F ig. 2 is a central verticalsection of the same. Fig. 3 is a sectional view of the same on the line3 3 of Fig. 2. j

Likecharacters of reference indicate like parts in the various views.

In the drawings 4 indicates a bush which is mounted in an opening of, acamera closure 5 by means of a'flange 6 secured to' the cassure 5 shownis similar to the closure'described and claimed in U. .8. application,April 28, picture present bush 8, as here- 1919, for improvement inmotion cameras and tripods of which the application is a division. Asecond in which a camera lens 9 is mounted,

mg with headed screws 7. The camera clo,-.

has external screw threads 10 formed on the outer surface at therearward end thereof, which screw threads engage corresponding internalscrew threads formed on the inner surface of bush 4 at the rearward endthereof. The camera lens 9 is secured within the bush 8 by means of aninternally threaded ring 11 screw threaded upon the rear end of the lensbody 12 against the-rearwardly facing shoulder of the usual flange 13 ofthis body and an externally flanged clamp ring 14 the rear end of ring11 and having its flange engaging the rear surface of an internal rib15, formed on the bush 8, and clamping the rear end of the ring 11against the front surface of this rib, See Fig. 2. Thus it will benoted-that the lens is secured within the lens bush 8 by means whichdoes not require fine inafter described,

screw-threaded into and this application filed October i screw threadsto be formed on the bush 8,

thereby permitting the bush 8 to be formed of aluminum without the usualdifliculties incident to cutting fine threads in aluminum. A headedscrew 16 is disposed radially in a countersunk hole in the bush 8 and isscrewthreaded into the ring 11 and engages a hole in the lens body 12 tomaintain the lens body and bush 8 in proper relation. threadedengagement of the bushes 4 and 8 provide a-focal adjustment for and thescrew threads 10 are preferably of such a pitch that the several focaladjust mentsof the lens are made within one revolution of the bush8Iwith relation to bush 4.

front of the bush 4 is provided with an index 17 which is co-relatedwith a cut 18 formed in the adjacent edge of bush 4 to determine theadjustments of the lens, and by reason of the fact that the severaladjustments of the revolution of the lens are effected within one bush8- within bush 4, this index is a simple one and requires no calculationin the use thereof. By the lens mounting just described the quickinterchange of lenses may be accomplished as the bush 8 is suflicientlylarge to accommodate a variety of lenses and each lens is mounted withina bush 8 adapted. to fit within the bush 4 and having screw threads 10adapted to engage the internal screw threads of bush 4, and in changinglenses it is only necessary to remove the bush 8 with the lens carriedtherein and to the lens 9 The screwbush 8 within engage pin aheaded-screw 20. See Figs. 1 and 3.

at the- 'frontend thereof in front of the closure of the camera is aspring blade 19 which is disposed circumferentially of the bush and issecured thereto at its one endrlply e free end of this blade has aradially disposed pin 21 extending inwardly through an aperture in bush4 to engage the bush 8 to provide a frictional engagement between thebushes to prevent accidental movement of bush 4. This frictionalengagement may be broken to permit the easy removal of bush 8 withinbush 4 by a blade 22 pivo'tally secured upon bush 4' by means of aheaded screw 23 and having a beveled edge 24 disposed radially withrespect to screw 23 and adapted, when the blade 22 is pivoted upon screw23-inrone direction, to

move between thebush 4 and the free end of spring blade 19 to move thisend of the spring blade away from the bush and to d1s- 21 fromengagement with bush 8.

, Another headed screw 25 passes through an enlarged aperture in blade22 to limit the movement thereof.

The forward end of the bore of bush 4 is enlarged to accommodate theenlarged front end of bush 8, the front end of whose bore is alsoenlarged to receive 'athird bush 26, which is rotatable within bush 8and is retained therein by a radially disposed screw 27screw-threadedinto-bush 8 and having its end engaging a circumferentialgroove 28 formed on the outer surface of said bush 26. The lens 9 isprovided with a usual iris mechanism 29 which is controlled by anadjustment ring 30 mounted for limited rotation on the lens body 12,.and aradially disposed pin 31 secured upon bush 26. engages alongitudinal slot in ring 30 to provide an operative connection betweenring 30 and bush 26 whereby the adjustment of the iris of the lens maybe effected by rotatory movement of bush 26 within bush 8.

While I have described and shown the preferred embodiment of myinvention I do not wish to be limited to the precise details ofconstruction as changes may readily be made without departing from thespirit of my invention, but having thus described'my invention, I claimas new and desire to secure by Letters Patent the following 1. A deviceof the character described in cluding an internally threaded bush, anexternally threaded bush screwthreaded into said first mentioned bush,and. a friction device including a friction element mounted on one ofsaid bushes and frictionally engaging the other bush and adapted to bedisengaged from said other bush to permit easy maniping said busheswhile in screwthreaded engagement in various adjustments againstaccidental relative movement and including a resilient element fixedwith one of said bushes and engaging the other bush and adapted to bedisengaged from said other bush to permit manipulation of said bushesinto and out of screwthreaded engagement.

3. A device of the character described including an internally threadedbush, an externally threaded bush screwthreaded into said firstmentioned bush, a friction device normally frictionally connecting saidbushes and including a resilient element mounted on one of said bushes,and a releasing element movably mounted on said one bush and adaptedwhen moved to one position to move said-resilient element to releasesaid bushes of said frictional connection and adapted while in suchposition to maintain said ,resilient element in releasing position. 4.Adevice of the nature described including an internally threaded bush,anexternally threaded bush screwthreaded into said first mentioned bush,a friction device normally frictionally connecting said bushes bush, anda releasing lever pivotallv mounted on said first mentioned bush andadapted when moved to one position to move the free end of said springelement to release said,- bushes of said frictional clonnection randadapted while in such position to maintain said spring elementin-releasing posi-' tion.

5; A device of the nature cluding ternally said firstmentioned bush, afriction device normally frictionally connecting said bushes andincluding a flat spring element secured adjacent one of its ends-to theouter surface of said first mentioned bush, and a releasing leverpivotally mounted on the outer surface of said'first mentioned bush andadapted when moved to one position to move between said first mentionedbush and the spring element and to move the free end of said springelement to release said bushes of said frictional connection and adaptedwhen in such position to maintain said spring element in releasingposition.

'6- A device of the character described including a bush extending circuar-rib, a lens body within said bush and having a rearwardly facingshoulder, a ring screwthreaded upon the an internally threaded bush, anexdescribed inthreaded bush screwthreaded into rovided with aninternally shoulder, a ring screwthreaded upon the lens body against theshoulder thereof and adapted to be clamped against a side of saidinternally extending rib, and a clamp ring screwthreaded into said firstmentioned ring and having an externally extending circular rib adaptedto be clamped against the side of said first mentioned rib opposite thatagainst. which said first mentioned ring is adapted to be clamped,

v 8. A device of the character described including a bush provided withan internally circular rib, a lens body within and having a rearwardlyfacing shoulder, a ring screwthreaded upon the lens body. against theshoulder thereof and adapted to be clamped against a side of saidinternally. extending rib, and a clamp ring in screwthreadedengagement'with the extendlnlg said bus rear end of said first mentionedring and having an externally extending circular rib adapted to beclamped against the side of said first mentioned rib opposite thatagainst which said firstmentioned ring is adapted to be clamped. I

9. A'device of the character described including a bush provided with aninternally extending circular rib, a lens bodywithin said bush andhaving a rearwardly facing shoulder, a ring screwthreaded upon the lensbody against the shoulder thereof and adapted to be clamped againstaside of said internally extending rib means for rotatively fixingvsaidlens body and ring within said bush including a radially disposed headedscrew extending through an opening in said ring and screwthreaded intosaid lens body, and a clamp ring screwthreaded into said first mentionedlung and having an externally extending circular rib adapted to beclamped against the side of said first mentioned rib opposite thatagainst which said first-mentioned ring is adapted to be clamped.

In witness whereof I hereunto aflix my sigrlisiture this ninth day ofOctober, 1919, A.

' ALBERT S. HOWELL.-

